162. In this skeleton, the answers to the questions are in
some cases printed, as "Who repair the tools?--Masters, Men"; in
order that the proper answer may be underlined with a pencil. In
filling up the answers which require numbers, some care should be
taken: for instance, if the observer stands with his watch in his
hand before a person heading a pin, the workman will almost
certainly increase his speed, and the estimate will be too large.
A much better average will result from enquiring what quantity is
considered a fair day's work. When this cannot be ascertained,
the number of operations performed in a given time may frequently
be counted when the workman is quite unconscious that any person
is observing him. Thus the sound made by the motion of a loom may
enable the observer to count the number of strokes per minute,
even though he is outside the building in which it is contained.
M. Coulomb, who had great experience in making such observations,
cautions those who may repeat his experiments against being
deceived by such circumstances: 'Je prie' (says he) 'ceux qui
voudront les repeter, s'ils n'ont pas le temps de mesurer les
resultats apres plusiers jours d'un travail continu, d'observer
les ouvriers a differentes reprises dans la journee, sans qu'ils
sachent qu'ils sont observes.
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